diff --git a/udp/udp-tracer-server-client.py b/udp/udp-tracer-server-client.py
new file mode 100644
index 0000000..5c07b44
--- /dev/null
+++ b/udp/udp-tracer-server-client.py
@@ -0,0 +1,99 @@
+# -*-  Mode: Python; -*-
+
+
+import ns.core
+import ns.csma
+import ns.applications
+import ns.internet
+
+def main(argv):
+	#
+	# Users may find it convenient to turn on explicit debugging
+	# for selected modules; the below lines suggest how to do this
+	#
+	ns.core.LogComponentEnable("UdpTraceClient", ns.core.LOG_LEVEL_INFO)
+	ns.core.LogComponentEnable("UdpServer", ns.core.LOG_LEVEL_INFO)
+
+	#
+	# Allow the user to override any of the defaults at
+	# run-time, via command-line arguments
+	#
+	cmd = ns.core.CommandLine ()
+	cmd.useIpv6 = "False"
+	cmd.AddValue ("useIpv6", "Use Ipv6")
+	cmd.Parse (argv)
+	
+	 
+	
+	
+	print "Create nodes."
+	n = ns.network.NodeContainer ()
+	n.Create (2)
+	
+	internetstack = ns.internet.InternetStackHelper ()
+	internetstack.Install (n)
+	
+	# 
+	# Explicitly create the channels required by the topology (shown above).
+	# 
+	print "Create channels."
+	csma = ns.csma.CsmaHelper ()
+	csma.SetChannelAttribute ("DataRate", ns.core.StringValue ("5000000"))
+	csma.SetChannelAttribute ("Delay", ns.core.TimeValue (ns.core.MilliSeconds (2)))
+	csma.SetDeviceAttribute ("Mtu", ns.core.UintegerValue (1400))
+	d = csma.Install (n)
+	
+	# 
+	# We've got the "hardware" in place.  Now we need to add IP addresses.
+	# 
+	print "Assign IP Addresses."
+	if (cmd.useIpv6 == "False"):
+		ipv4 = ns.internet.Ipv4AddressHelper ()
+		ipv4.SetBase (ns.network.Ipv4Address ("10.1.1.0"), ns.network.Ipv4Mask ("255.255.255.0"))
+		i = ipv4.Assign (d)
+		serverAddress = ns.network.Address (i.GetAddress (1))
+	    
+	else:
+		ipv6 = ns.internet.Ipv6AddressHelper ()
+		ipv6.SetBase (ns.network.Ipv6Address ("2001:0000:f00d:cafe::"), ns.network.Ipv6Prefix (64))
+		i6 = ipv6.Assign (d)
+		serverAddress = ns.network.Address (i6.GetAddress (1, 1))
+
+	print "Create Applications."
+	# 
+	
+	#
+	port = 4000  # well-known echo port number
+	server = ns.applications.UdpEchoServerHelper (port)
+	serverapps = server.Install (n.Get (1))
+	serverapps.Start (ns.core.Seconds (1.0))
+	serverapps.Stop (ns.core.Seconds (10.0))
+	
+	
+	
+	MaxPacketSize = 1472
+	client = ns.applications.UdpTraceClientHelper (serverAddress, port, "")
+       # client= ns.applications.UdpTraceClientHelper(serverAddress,port,"")
+        client.SetAttribute ("MaxPacketSize", ns.core.UintegerValue (MaxPacketSize))
+	
+	apps = client.Install (n)
+	apps.Start (ns.core.Seconds (2.0))
+	apps.Stop (ns.core.Seconds (10.0))
+	
+	
+
+	asciitracer = ns.network.AsciiTraceHelper ()
+	csma.EnableAsciiAll (asciitracer.CreateFileStream ("udp-trace.tr"))
+	csma.EnablePcapAll ("udp-trace", False)
+	
+	# 
+	# Now, do the actual simulation.
+	# 
+	print "Run Simulation."
+	ns.core.Simulator.Run ()
+	ns.core.Simulator.Destroy ()
+	print "Done."
+
+if __name__ == '__main__':
+    import sys
+main (sys.argv)